He'd better fiddle with more than just the engine if he wants the car to cope with all the extra power!! I mean, he's almost doubled the car's power, i'm sure he'll have to make some substantial modifications to suspension etc...
Well i'm not sure what he's doing about the suspension but he is planning to use the 75 gearbox.
But isn't the only thing. His brother has a 33 and is making it a rear wheel drive and putting a modified engine in. At the moment the body is getting strengthened and this thing wil be scary.
There was no Giulietta in 1984, that could be why you can't find one. The GTV-6 was availible in '84, and so was the Veloce Spyder. You could be thinking of those.